diff --git a/package-lock.json b/package-lock.json
index 794cb91..163043d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -680,6 +680,7 @@
           "version": "0.1.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "kind-of": "^3.0.2",
             "longest": "^1.0.1",
@@ -1472,7 +1473,8 @@
         "longest": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "loose-envify": {
           "version": "1.3.1",
@@ -2553,9 +2555,9 @@
       "dev": true
     },
     "tough-cookie": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.2.tgz",
-      "integrity": "sha1-8IH3bkyFcg5sN6X6ztc3FQ2EByo=",
+      "version": "2.3.4",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
+      "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
       "dev": true,
       "requires": {
         "punycode": "^1.4.1"